pressure 1[N/m^2] Internal pressure
th 2[cm] Wall thickness
De 52[cm] External cylinder diameter
Di De-2*th Internal cylinder diameter
Ri Di/2 Internal cylinder radius
sf 3.5*th Straight flange height
Rk 0.1*De Internal knuckle radius
Rc 0.9*Di Internal crown radius
hi Rc-sqrt((Rc-Ri)*(Rc+Ri-2*Rk)) Internal head height
alpha atan((Ri-Rk)/(Rc-hi)) Angle at intersection crown-knuckle
hcyl 40[cm] Half cylinder height